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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Elastomers and Composites
Journal Basic Information
Journal DOI :
The Rubber Society of Korea
Editor in Chief :
Volume & Issues
Volume 45, Issue 4 - Dec 2010
Volume 45, Issue 3 - Sep 2010
Volume 45, Issue 2 - Jun 2010
Volume 45, Issue 1 - Mar 2010
Selecting the target year
A Trend of R&D in Enviromental Thermoplastic Elastomer
Lee, Yong-Sang ; Jeong, Jung-Chea ; Park, Jong-Man ;
Elastomers and Composites, volume 45, issue 4, 2010, Pages 245~249
Much interest on the thermoplastic elastomers (TPEs) has recently been attracted in commercial fields as well as scientific and applied research. The TPEs have their own characteristic area especially in relation with block copolymers as well as many other polymeric materials, since they show interesting features displayed by the conventional vulcanized rubber, and at the same time, by the thermoplastics. In addition, they are characterized by a set of interesting properties inherent to block and graft copolymers, variety of blends and vulcanized materials. The importance of TPE as organic materials can be evaluated by the number of published reports (papers, patents, technical reports, etc). For the suitable introduction of the TPE, historic, scientific, technical and commercial considerations should be taken into account. This review article starts with a brief discussion on historical considerations, followed by a introduction of the main preparations and analytical techniques utilized in chemical, structural, and morphological studies. The properties, processing tools, the position among organic materials, and applications of TPEs are also briefly reviewed. Finally, the most probable trends of their future development are discussed in a short final remarks.
Stress Relaxation and Nonlinear Viscoelastic Model of PAN-PVC Copolymers
Kim, Nam-Jeong ;
Elastomers and Composites, volume 45, issue 4, 2010, Pages 250~255
From the three element non-Newtonian model of one non-Newtonian viscoelastic Maxwell elements and a elastic spring, the stress relaxation equation was derived. The various model parameters of this equation were evaluated by appling the experimental results of stress relaxation to the stress relaxation equation. The theoretical curves calculated from this model parameters agreed with the experimental stress relaxation curves. From the parameters of nonlinear viscoelastic model, the hole volume, fine structure, viscoelastic properties and mechanical properties of polymer fibers were studied. The experiments of stress relaxation were carried out using the tensile tester with the solvent chamber. The stress relaxation curves of the two types polyacrylonitrile-polyvinylchloride copolymer and another two types PVC monofilament fibers were obtained in air and water of various temperatures.
Dispersion Polymerization of Acrylate Monomers in Supercritical
using GMA-functionalized Reactive Surfactant
Park, Kyung-Kyu ; Kang, Chang-Min ; Lee, Sang-Ho ;
Elastomers and Composites, volume 45, issue 4, 2010, Pages 256~262
Dispersion polymerization of methyl acrylate, ethyl acrylate, butyl acrylate, and glycidyl methacrylate were performed in supercritical
and 346 bar. Glycidyl methacrylate linked poly(dimethylsiloxane) (GMS-PDMS) surfactant, which was prepared by linking glycidyl methacrylate to monoglycidyl ether terminated PDMS with amino-propyltriethoxysilane, was used as surfactant for the dispersion polymerization in
. The yield of the poly(alkyl acrylate) polymers, synthesized in
medium, decreased as the alkyl tail of the acrylate monomers increased. Poly(glycidyl methacrylate) and poly(methyl acrylate) were produced in bead form whereas poly(ethyl acrylate) and poly(butyl acrylate) were viscous liquid. The poly(glycidyl methacrylate) particles had a number average diameter of 2.45
and monodisperse distribution. The poly(methyl acrylate) had a number average diameter of 0.52
and the particle size distribution was bimodal. The glass transition temperatures (
) of the poly(glycidyl methacrylate) and the poly(alkyl acrylate) products were 4~9 K higher than the
of the corresponding acrylate polymers synthesized in conventional processes.
Life-time Prediction of a FKM O-ring using Intermittent Compression Stress Relaxation (CSR) and Time-temperature Superposition (TTS) Principle
Lee, Jin-Hyok ; Bae, Jong-Woo ; Kim, Jung-Su ; Hwang, Tae-Jun ; Park, Sung-Doo ; Park, Sung-Han ; Min, Yeo-Tae ; Kim, Won-Ho ; Jo, Nam-Ju ;
Elastomers and Composites, volume 45, issue 4, 2010, Pages 263~271
Intermittent CSR testing was used to investigate the degradation of an FKM O-ring, also the prediction of its life-time. An intermittent CSR jig was designed taking into consideration the O-ring's environment under use. The testing allowed observation of the effects of friction, heat loss, and stress relaxation by the Mullins effect. Degradation of O-rings by thermal aging was observed between 60 and
. In the high temperature of range (
) O-rings showed linear degradation behavior and satisfied the Arrhenius relationship. The activation energy was about 60.2 kJ/mol. From Arrhenius plots, predicted life-times were 43.3 years and 69.9 years for 50% and 40% failure conditions, respectively. Based on TTS (time-temperature superposition) principle, degradation was observed at
, and could save testing time. Between 60 and
the activation energy decreased to 48.3 kJ/mol. WLF(William-Landel-Ferry) plot confirmed that O-rings show non-linear degradation behavior under
. The life-time of O-rings predicted by TTS principle was 19.1 years and 25.2 years for each failure condition. The life-time predicted by TTS principle is more conservative than that from the Arrhenius relationship.
Synthesis of Environmental-Friendly Starch-acrylic Coating Sols by Emulsion Polymerization
Li, Mei-Chun ; Mun, Yoo-Ju ; Cho, Ur-Ryong ;
Elastomers and Composites, volume 45, issue 4, 2010, Pages 272~279
Starch is an environmental-friendly natural source, more interests are attracted to use starch for synthesis of composites and coating sols. Starch-acrylic coating sols for architectural materials were synthesized by emulsion polymerization. The structures of synthesized materials were characterized by using Infrared spectra,
-NMR spectra, and physical characteristics were investigated by X-ray diffraction, foaming test, whiteness test, gloss test and tensile strength test. XRD results showed that starch in starch-acrylic copolymer matrix was in an amorphous state. Starch-acrylic emulsion was compounded with 1%, 3%, 5% foaming agent (n-pentane) and 60%
solution. The results showed that starch and foaming agent could increase the foamability. Tensile strength increased with the enhancement of starch and foaming agent concentration. But whiteness and gloss decreased with increase of starch and foaming agent concentration.
Effects of Chlorobutyl Rubber Content on the Mechanical Properties of Chlorobutyl Rubber Blends
Park, Cha-Cheol ; Pyo, Kyung-Duk ;
Elastomers and Composites, volume 45, issue 4, 2010, Pages 280~285
The CIIR blends with SBR, NBR and BR were prepared with various mixing ratios. The mechanical and physical properties of these blends, such as frictional coefficient, abrasion resistance, compression set, and specific gravity, were measured. In the permanent compression set measurement, the blends at the composition of 75 wt% CIIR showed the highest value, which means the lowest resistance to deformation. As SBR, NBR and BR blends with CIIR, the coefficient of friction of the mixtures showed a tendency to decrease in arithmetic average. In the case of blending CIIR with BR in order to increase the friction force, the negative effect due to reduction in abrasion resistance was greater than the positive effect of the improvement of the traction force caused by increasing friction coefficient.
Synthesis of Liquid-Crystalline Polymer Containing Coumarin Moieties by Photopolymerization
Lee, Jong-Back ; Lee, Kwang-Hyun ; Kang, Byung-Chul ;
Elastomers and Composites, volume 45, issue 4, 2010, Pages 286~290
Liquid-crystalline (LC) monomer, which was functionalized with a coumarin group on their extremity, was synthesized by UV light irradiation in their LC phases. LC monomer was converted into the dimers by the cycloaddition reaction of the coumarin group, and the LC phases were maintained after photodimerization reaction. The dimers showed LC phases in the wider temperature range than those of the corresponding monomer. Structures of the compound were identified by FT IR and
NMR spectroscopies. Their phase transition temperatures and thermal stability were also investigated by differential scanning calorimetry (DSC), gel permeating chromatography (GPC) and polarized optical microscopy (POM). From optical polarizing microscopy, the prepared polymer shows enantiotropic liquid crystallinity with smectic and nematic textures.
A Study on the Influence of Strut Insulator Aging on Vehicle Noise
Son, Seong-Hyun ; Kang, Sung-Su ; Kim, Gug-Yong ; Park, Soon-Cheol ;
Elastomers and Composites, volume 45, issue 4, 2010, Pages 291~297
Strut insulator in a vehicle is an important part to prevent noise and vibration which is created for driving on the road. Most of the viscoelastic-mounts are made of rubber and natural rubber is the key ingredient. These rubber products show well performance for the initial time, but they will degrade after they are exposed to a high temperature circumstance and a cyclic load. NVH performance and comfort in a vehicle were decreased by these degradation of the rubber. In this study, spring displacement in a vehicle was measured to make a profile in the simulation test performed with an acceleration sensor. In addition, acceleration level, rubber permanent deformation and hardness of the rubber were measured according to drive distance and vehicle model.
Study on the Characteristics of the Hybrid Parylene Thin Films
Cha, Gook-Chan ; Lee, Ji-Yeon ; Jung, Seong-Hee ; Song, Jeom-Sik ; Lee, Suk-Min ;
Elastomers and Composites, volume 45, issue 4, 2010, Pages 298~308
The mechanical properties and surface characteristics of parylene thin film were improved using Xylydene-based dimers (DPX-C, DPX-D, and DPX-N). A single-parylene-C, D, N film and a hybrid chemical and physical parylene thin films in which two types are mixed were manufactured for each dimer by adjusting the deposition conditions and the thickness of the thin film by input. Parylene was deposited by chemical vapor deposition (CVD) and the thermal characteristics of the single thin film and the hybrid thin film were compared by thermal analysis. The mechanical properties of the thin films were characterized by tensile strength, elongation, and tear force tests, and the surface characteristics of the thin films were evaluated by contact angle and surface energy measurements. The hybrid chemical parylene thin film in which two types are mixed can complement the strengths and weaknesses of the different dimers, while the physical parylene thin film can freely adjust the thin film characteristics of the coated surface and the opposite surface.
A Study on the Viscoelastic Properties of Rubber Blends for Shoes Outsole
Park, Cha-Cheol ; Pyo, Kyung-Duk ;
Elastomers and Composites, volume 45, issue 4, 2010, Pages 309~315
The CIIR blends, which is use for shoes outsole, with SSBR, XNBR and KBR were prepared with various mixing ratio. The viscoelastic properties of these blends, such as tensile modulus, rebound resilience, storage modulus, tan
, and creep properties were measured. In the rebound resilience measurement, KBR showed the highest value, which means the lowest energy absorption to stress. As SSBR, XNBR and KBR blends with CIIR, the rebound resilience of the mixtures showed tendency to increase in arithmetic average. In the creep measurement, CIIR showed the highest visconse strain to stress, SSBR and KBR showed lower visconse strain. Maximum tan
peak of CIIR, SSBR and XNBR appeared at